GeoGebra

What do you like best?

The ability to share and view/edit the work of others. This is HUGE. It's a great tool to show dynamic relationships to students - I typically use it as a demo tool during explanation of a concept.

What do you dislike?

The organization of all the teacher created boards is not that good. There are a lot of repeats and some poor quality items. I wish Geogebra could curate or at least have "favorites" list for given topics. It's difficult for new teachers to learn.

What problems are you solving with the product? What benefits have you realized?

Helping student prove or visualize geometric relationships. Benefits include the feedback from students who say, "Oh, now I see" since visualization of concepts is huge when looking at various theorems and proofs. It also introduces the idea of proof... we could look at ALL possibilities by dragging vertices in all possible places (which is technically impossible) or do a mathematical proof to show the theorem works for every case.